Remove Quantity Box From Buy All

We have various Buy all items in several of our price lists but some of these we don't want to have the quantity box as it is a one time purchase. For instance, with a download of all images in the gallery.  How do I do this?

Sorry but there isn't a way to remove the quantity option for those and no sort of workaround.

Thank you Tim

I wrote a warning in the description of buy all item to not order more than once per gallery.  

Thanks for the idea Shawn ...we haven't actually had someone order multiple downloads of the same image yet but it just looks a little unprofessional either way for us. As a film lab, we are using this software for a purpose it wasn't intended though.